I. Understanding Fiqh Sciences
Allah says in Surah At Tawbah : 123;
So if not better than each group a class of humans to air tafaqquh (understand fiqh) in the affairs of religion and to warn their people when they return; hopefully be able to take care of his people (keep limit orders and prohibitions of Allah).
Whoever desired by God given goodness and virtue, undoubtedly given to him to late-faqih (jurisprudent understand) in matters of religion. (Narrated by Bukhari, Muslim).
Fiqh is the science of knowing God's law relating to all the good that must amaliah mukallaf, sunna, or permissible, makrooh or haram unearthed from the obvious arguments (tafshili).
Product fiqh is fiqh. While the rules istinbath (issued) law from the source studied in Usul Fiqh.